How do I format JSON online?
Open the DevTools JSON Formatter page, paste your JSON, and click Format. The tool outputs indented JSON locally in your browser—no registration required.
JSON Formatter
DevTools JSON Formatter turns minified JSON into readable indented output in your browser, with 2- or 4-space options. Processing is 100% local—nothing is uploaded, and no sign-up is required.
JSON input
About this tool
Paste JSON from an API response or config file and click Format to get structured output. Syntax errors show line and column numbers to speed up debugging.
How to use
- Paste your JSON text.
- Choose an indent width (2 or 4 spaces).
- Click Format and copy the result.
FAQ
Does JSON formatting leak my data?
No. All processing runs locally in your browser. Your text is never uploaded to DevTools servers.
How large a JSON file can I format?
Files up to a few MB usually work smoothly. For very large payloads, consider command-line tools such as jq.
Is the JSON Formatter free?
Yes. DevTools is free for normal use and does not require an account.
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